/* Copyright (c) 2006 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
*/
#region Using directives

#define USE_TRACING

using System;
using System.IO;
using System.Net;
using System.Security.Cryptography;

#endregion

/////////////////////////////////////////////////////////////////////
// <summary>contains AuthSub request helper classes
// </summary>
////////////////////////////////////////////////////////////////////
namespace Google.GData.Client
{
    //////////////////////////////////////////////////////////////////////
    /// <summary> GDataAuthSubRequestFactory implementation</summary> 
    //////////////////////////////////////////////////////////////////////
    public class GAuthSubRequestFactory : GDataGAuthRequestFactory
    {

        /// holds the private key that is used to sign the requests
        private AsymmetricAlgorithm privateKey;

        //////////////////////////////////////////////////////////////////////
        /// <summary>default constructor</summary> 
        //////////////////////////////////////////////////////////////////////
        public GAuthSubRequestFactory(string service, string applicationName) : base(service, applicationName)
        {
        }
        /////////////////////////////////////////////////////////////////////////////


        //////////////////////////////////////////////////////////////////////
        /// <summary>default constructor</summary> 
        //////////////////////////////////////////////////////////////////////
        public override IGDataRequest CreateRequest(GDataRequestType type, Uri uriTarget)
        {
            return new GAuthSubRequest(type, uriTarget, this); 
        }
        /////////////////////////////////////////////////////////////////////////////

        //////////////////////////////////////////////////////////////////////
        /// <summary>accessor method public string Token</summary> 
        /// <returns>the string token for the authsub request </returns>
        //////////////////////////////////////////////////////////////////////
        public string Token
        {
            get {return this.GAuthToken;}
            set {this.GAuthToken = value;}
        }
        // end of accessor public string Token

        //////////////////////////////////////////////////////////////////////
        /// <summary>accessor method public AsymmetricAlgorithm PrivateKey</summary> 
        /// <returns>the private Key used for the authsub request </returns>
        //////////////////////////////////////////////////////////////////////
        public AsymmetricAlgorithm PrivateKey
        {
            get {return this.privateKey;}
            set {this.privateKey = value;}
        }
        // end of accessor public string Token



    }
    /////////////////////////////////////////////////////////////////////////////


    //////////////////////////////////////////////////////////////////////
    /// <summary>base GDataRequest implementation</summary> 
    //////////////////////////////////////////////////////////////////////
    public class GAuthSubRequest : GDataGAuthRequest
    {
        /// <summary>holds the factory instance</summary> 
        private GAuthSubRequestFactory factory; 


        //////////////////////////////////////////////////////////////////////
        /// <summary>default constructor</summary> 
        //////////////////////////////////////////////////////////////////////
        internal GAuthSubRequest(GDataRequestType type, Uri uriTarget, GAuthSubRequestFactory factory)  : 
                base(type, uriTarget, factory)
        {
            this.factory = factory; 
        }
        /////////////////////////////////////////////////////////////////////////////

         //////////////////////////////////////////////////////////////////////
        /// <summary>sets up the correct credentials for this call, pending 
        /// security scheme</summary> 
        //////////////////////////////////////////////////////////////////////
        protected override void EnsureCredentials()
        {
            HttpWebRequest http = this.Request as HttpWebRequest; 

            string header = AuthSubUtil.formAuthorizationHeader(this.factory.Token, 
                                                                               this.factory.PrivateKey, 
                                                                               http.RequestUri,
                                                                               http.Method);
            this.Request.Headers.Add(header);
        }
        /////////////////////////////////////////////////////////////////////////////
    }
    /////////////////////////////////////////////////////////////////////////////
} 
/////////////////////////////////////////////////////////////////////////////
